triggers and backend

cmd/setup/44/postgres/02_create_trigger.sql

@@ -0,0 +1,26 @@
+DROP TRIGGER IF EXISTS reduce_instance_added ON eventstore.events2;
+
+CREATE OR REPLACE FUNCTION zitadel.reduce_instance_added() 
+RETURNS TRIGGER AS $$
+BEGIN
+    INSERT INTO zitadel.instances (
+        id
+        , name
+        , change_date
+        , creation_date
+    ) VALUES (
+        (NEW).aggregate_id
+        , (NEW).payload->>'name'
+        , (NEW).created_at
+        , (NEW).created_at
+    )
+    ON CONFLICT (id) DO NOTHING;
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql;
+
+CREATE TRIGGER reduce_instance_added
+AFTER INSERT ON eventstore.events2
+FOR EACH ROW
+WHEN (NEW).event_type = 'instance.added'
+EXECUTE FUNCTION reduce_instance_added();